Radio communication semiconductor integrated circuit, data processing semiconductor integrated circuit and portable device
First Claim
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1. A portable device comprising:
- a radio communication semiconductor integrated circuit which has a function of detecting a frequency drift of a clock signal based on time information for synchronization included in received data and is operated in synchronization with said clock signal to perform processing of modulating transmitted data and processing of demodulating the received data, said radio communication semiconductor integrated circuit comprising a terminal or an interface for outputting a signal including its own time information to the outside; and
a data processing semiconductor integrated circuit which is operated in synchronization with a clock signal and performs compression processing of data to be transmitted and decompression processing of received data, said data processing semiconductor integrated circuit comprising a terminal or an interface for inputting a signal including time information from the outside;
wherein the radio communication semiconductor integrated circuit and the data processing semiconductor integrated circuit are coupled so that said signal including time information is fed from said radio communication semiconductor integrated circuit via said terminal or interface to said data processing semiconductor integrated circuit 6,wherein said data processing semiconductor integrated circuit has a second timer, and synchronizes the data processing semiconductor integrated circuit with said radio communication semiconductor integrated circuit based on the time information of said second timer and said time information fed via said terminal or interface; and
wherein said data processing semiconductor integrated circuit has a function of direct memory access (DMA) transferring sampled voice data or image data and based on a difference between said time information fed from said radio communication semiconductor integrated circuit to said data processing semiconductor integrated circuit and time information of said second timer, the number of said voice data or image data DMA transferred is set to synchronize time of said radio communication semiconductor integrated circuit with time of said data processing semiconductor integrated circuit.
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Abstract
A portable device having a communication function composed of a plurality of LSIs operated in synchronization with a clock, such as a baseband LSI and a logic LSI such as an application processor, can synchronize the baseband LSI with the logic LSI without lowering the performance of the logic LSI.
134 Citations
4 Claims
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1. A portable device comprising:
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a radio communication semiconductor integrated circuit which has a function of detecting a frequency drift of a clock signal based on time information for synchronization included in received data and is operated in synchronization with said clock signal to perform processing of modulating transmitted data and processing of demodulating the received data, said radio communication semiconductor integrated circuit comprising a terminal or an interface for outputting a signal including its own time information to the outside; and a data processing semiconductor integrated circuit which is operated in synchronization with a clock signal and performs compression processing of data to be transmitted and decompression processing of received data, said data processing semiconductor integrated circuit comprising a terminal or an interface for inputting a signal including time information from the outside; wherein the radio communication semiconductor integrated circuit and the data processing semiconductor integrated circuit are coupled so that said signal including time information is fed from said radio communication semiconductor integrated circuit via said terminal or interface to said data processing semiconductor integrated circuit 6, wherein said data processing semiconductor integrated circuit has a second timer, and synchronizes the data processing semiconductor integrated circuit with said radio communication semiconductor integrated circuit based on the time information of said second timer and said time information fed via said terminal or interface; and wherein said data processing semiconductor integrated circuit has a function of direct memory access (DMA) transferring sampled voice data or image data and based on a difference between said time information fed from said radio communication semiconductor integrated circuit to said data processing semiconductor integrated circuit and time information of said second timer, the number of said voice data or image data DMA transferred is set to synchronize time of said radio communication semiconductor integrated circuit with time of said data processing semiconductor integrated circuit. - View Dependent Claims (2, 3, 4)
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Specification
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Current AssigneeRenesas Electronics Corporation
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Original AssigneeRenesas Technology Corporation (Renesas Electronics Corporation)
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InventorsKunori, Masafumi, Nakagawa, Tetsuya
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Primary Examiner(s)Tran; Tuan A
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Application NumberUS10/948,138Publication NumberTime in Patent Office1,495 DaysField of Search4555561- 2, 455/557, 455/558, 455 68- 71, 455/500, 455/502, 455/418, 455/420, 455/323, 455/333, 375/219, 375/220, 375354-355, 375358-359, 375371-372, 375/376, 370/395.62, 370/516, 370518-520US Class Current455/557CPC Class CodesH03J 7/02 Automatic frequency control...
